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KR-20260062107-A - Nd-Fe-B bonded magnet manufacturing mixing device

KR20260062107AKR 20260062107 AKR20260062107 AKR 20260062107AKR-20260062107-A

Abstract

The present invention relates to a mixing device for manufacturing Nd-Fe-B bonded magnets, and more specifically, to a mixing device for mixing magnet powder and binder resin in a process for manufacturing Nd-Fe-B bonded magnets, wherein the input, mixing, discharge, and dust collection of magnet powder and binder resin are performed continuously, thereby continuously mixing a large amount of magnet powder and binder resin while freely adjusting the setting of the mixing amount and ensuring that the set mixing ratio is not exceeded, so as to enable the production of high-quality Nd-Fe-B bonded magnets.

Inventors

  • 이경재
  • 김창수
  • 강병현

Assignees

  • 주식회사 에스아이티

Dates

Publication Date
20260507
Application Date
20241024

Claims (5)

  1. As a mixing device for magnet powder and binder resin for manufacturing Nd-Fe-B bonded magnets, A mixing body (10) comprising: an inner tube (11) having a mixing space (16) for mixing magnet powder and binder resin; an outer tube (12) into which the inner tube (11) is rotatably inserted; an inlet (13) for introducing magnet powder and binder resin into the mixing space (16); an outlet (14) for discharging the mixed mixture; and a stirring means (15) rotatably provided in the inner tube (11), with one end exposed to the outside of the outer tube (12); A transfer module (20) that moves and stops the above mixing body (10) along a designated path; A rotary module (30) that transmits rotational power to a stirring means (15) of a mixing body (10) moved through the above transfer module (20); It includes a dust collection module (40) for collecting residue remaining in the mixing space (16) of the mixing body (10) that has been moved through the transfer module (20); The above mixing body (10) is provided with an input module (50) for introducing magnet powder and binder resin, and It further includes a discharge module (60) for discharging the mixed powder, A mixing device for manufacturing Nd-Fe-B bonded magnets, characterized in that the mixing body (10) moves along a designated path installed through the transfer module (20).
  2. In claim 1, the transfer module (20) is, A driving rail (21) installed to move the above mixing body (10) to a designated position, and A driving block (22) that is installed to be movable along the driving rail (21) and fixed to the bottom of the mixing body (10), and A mixing device for manufacturing Nd-Fe-B bonded magnets, characterized by including a power control unit (23) that moves and stops the driving block (22) according to the authorized power and signal.
  3. In claim 1, the dust collection module (40) is, A dust collection driving means (41) that is detachably coupled to the inner tube (11) of the mixing body (10) and rotates the inner tube (11) while operating by an applied power source and signal, and A fixed rod (42) that extends in the longitudinal direction and is formed in a telescopic shape that can be adjusted in the vertical direction, and which enters and exits through the input port (13) of the mixing body (10), and A plurality of brushes (43) installed at mutual intervals along the outer circumference of the fixed rod (42), and A dust collection tube (44) made of a flexible tubular body that can be adjusted in length and angle, to which one end of the fixed rod (42) is connected, and A mixing device for manufacturing Nd-Fe-B bonded magnets, characterized by including a dust collector (45) that provides suction force through the dust collection tube (44) while operating by an authorized power source and signal.
  4. In claim 3, the dust collection tube (44) comprises, A mixing device for manufacturing Nd-Fe-B bonded magnets, characterized by further comprising a coupling plate (441) having a coupling groove (442) to which the above-mentioned fixed rod (42) is detachably coupled, and a suction hole (443) through which the residue collected in the mixing space (16) of the above-mentioned mixing body (10) moves to the above-mentioned dust collection pipe (44).
  5. In any one of claims 1 to 3, the rotation module (30) is, A rotary power unit (31) that transmits rotary power to the stirring means (15) of the mixing body (10), and It includes a lifting means (32) that moves the above-mentioned rotary power unit (31) up and down, The above lifting means (32) is, A lifting plate (321) on which the above-mentioned rotary power unit (31) is installed, and A lifting cylinder (322) including a rod (323) whose upper end is coupled to the lower surface of the lifting plate (321), and A mixing device for manufacturing Nd-Fe-B bonded magnets, characterized by including a position alignment sensor (324) provided on the lifting plate (321) to detect the position of the stirring means (15).

Description

Nd-Fe-B bonded magnet manufacturing mixing device The present invention relates to a mixing device for manufacturing Nd-Fe-B bonded magnets, and more specifically, to a mixing device for mixing magnet powder and binder resin in a process for manufacturing Nd-Fe-B bonded magnets, wherein the input, mixing, discharge, and dust collection of magnet powder and binder resin are performed continuously, thereby continuously mixing a large amount of magnet powder and binder resin while freely adjusting the setting of the mixing amount and ensuring that the set mixing ratio is not exceeded, so as to enable the production of high-quality Nd-Fe-B bonded magnets. Nd-Fe-B permanent magnets include sintered magnets produced by the powder metallurgy process and bonded magnets manufactured by compression molding or injection molding using a mixture of magnet powder and resin. Unlike sintered magnets, which are produced by melting and casting raw alloys, the magnet powder for bonding is produced by ultra-rapid cooling of the molten alloy to form a thin ribbon-shaped band. While the size of the magnet powder in sintered magnets is about 3㎛, in bonded magnets, the magnet powder becomes aggregated fine particles of 0.3㎛ or less. The magnetic properties of these bonded magnets are fundamentally determined by the magnetic properties and content of the magnetic powder to be used, and Nd-Fe-B-based flake powder produced by the ultra-rapid cooling and hydrogenation treatment (HDDR: Hydrogenation Decomposition Desorption Recombination) process is mainly used. When the molten alloy of the above Nd-Fe-B composition is sprayed onto a rotating copper roll, the molten alloy rapidly solidifies to obtain a flaky powder. When this powder is heat-treated to crystallize it, a crystalline structure with a diameter of several tens of nm is formed. This fine crystalline structure exhibits high coercivity and possesses random crystal orientations that are magnetically isotropic. Although isotropic magnets have inferior magnetic properties compared to anisotropic magnets, they offer advantages such as high productivity, the ability to freely select the magnetization direction, and high shape freedom; consequently, most Nd-Fe-B magnets are isotropic Nd-Fe-B bonded magnets. Nd-Fe-B bonded magnets are produced by mixing magnet powder with a binder, such as epoxy resin or nylon resin, and then compression molding or injection molding. The amount of binder is approximately 10 to 20% (vol%) for epoxy resin and 30 to 50% (vol%) for nylon resin. Since the maximum magnetic energy of an isotropic bonded magnet is determined by the volumetric packing ratio of the magnet powder, a compression-molded bonded magnet using an epoxy resin with a low resin content is preferred when obtaining a high-energy magnet. As described above, in the process of manufacturing Nd-Fe-B bonded magnets, the volumetric filling rate is determined by the mixing ratio of the magnet powder and the binder; therefore, to provide the set volumetric filling rate, the magnet powder and the binder resin must be mixed according to the precise mixing ratio. However, since conventional mixing of magnet powder and binder uses a general powder mixer, there is a problem in that the mixing ratio deviates from the set mixing ratio due to residue remaining inside the mixer after one mixing cycle is completed, and this problem is that the set mixing ratio deviates rapidly as the number of mixing cycles increases. In order to solve the above problems, the inside of the mixer must be cleaned after each mixing cycle. However, as the time required for cleaning the mixer increases, the total time required for mixing the magnet powder and the binder increases, which makes it difficult to perform the mixing of the magnet powder and the binder in large quantities. FIG. 1 is an exemplary diagram illustrating a mixing apparatus for manufacturing Nd-Fe-B bonded magnets according to the present invention. FIG. 2 is an exemplary diagram illustrating a mixing body constituting the present invention. FIGS. 3 and FIGS. 4 are state diagrams illustrating the lifting state of a rotating module constituting the present invention. FIG. 5 is an exemplary diagram illustrating the combined state of a dust collection module constituting the present invention. FIG. 6 is an exemplary diagram illustrating a center plate placed in a connecting tube constituting the present invention. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. Hereinafter, a preferred embodiment of a mixing device for manufac